21220121202110 has 16 divisors (see below), whose sum is σ = 38196914375232. Its totient is φ = 8487893767200.

The previous prime is 21220121202029. The next prime is 21220121202131. The reversal of 21220121202110 is 1120212102212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18762326 + ... + 19861145.

It is an arithmetic number, because the mean of its divisors is an integer number (2387307148452).

Almost surely, 2^{21220121202110} is an apocalyptic number.

21220121202110 is a deficient number, since it is larger than the sum of its proper divisors (16976793173122).

21220121202110 is a wasteful number, since it uses less digits than its factorization.

21220121202110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38678419.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220121202110 its reverse (1120212102212), we get a palindrome (22340333304322).

The spelling of 21220121202110 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred two thousand, one hundred ten".